Feed mechanism for tool-carrying spindles



Sept. 4, ,1934.

c. F. SCHENCK FEED MECHANISM FOR TOQL CARRYING $PINDLES Filed June 4. 1931 4 Sheets-Sheet 1' Jwwnytot Cwc Wz/M MIMI Sept. 4, 1934. c SCHENCK 1,972,359

FEED MECHANISM FOR TOOL CARRYING SPINDLES Filed June 4. 1831 4 Sheets-Sheet 2 Jwuentot W4 [De/M P 1934- c. F. SCHENCK 1,972,359

FEED MECHANISM FOR TOOL CARRYING SPINDLES Filed June 4, 1951 4 Sheets-Sheet 3 P 4, 1934- c. F. SCHENCK 1,972,359

FEED MECHANISM FOR TOOL CARRYING 'SPINDLES Filed June 1931 4 Sheets-Sheet 4 II n u l I I l I I I I II I. lllll II Patented Sept. 4, 1934 *UETE STATES- memmsnma TOOL-CARRYING sriNo Es Charles F. Schenck, Toledo, Ohio, assignor to The Toledo General Manufacturing C mp ny,

Toledo, Ohio, a corporation of Ghio Application June. 4, 1981, Serial No. 542,006

'7 Claims.

This invention relates to metalv working. ma-

chinery, but more particularly to feeding mechanisms for spindles of: such machines which are rotated and axially movedto and from the work.

An object of this invention is toprovidea spindle feeding mechanism which may be. released from the drive and moved by hand. in order to actuate the spindle either toward or away from the work in a simpleand convenient manner; this 'Dibeing accomplished by the operator, who upon grasping a handle and moving. it in one direction or theother, disconnects the feed, and practically simultaneously moves the spindle to 'thedesired point, and substantially when thehandle is re--.

'fiileased the feed is operatively connected to the drive for actuating thefeed in the desired man-- Another object isto produce a, new and improved clutch for a feed mechanismof theabOve.

801 character which is simple inconstruction, easy to assemble, reliable in operation, and has the. novel features of construction, arrangement and operation hereinafter-described.

An embodiment of the invention is shown by iway of illustration on the accompanying draw-.

ings, in which:

Fig. 1 is a side elevation of a portion. of. a drill press showing the feeding mechanism for the tool-carrying spindle;

9: Fig. 2 is a vertical sectional. elevation of the clutch mechanism for controlling-thefeeding op: eration of the spindle;

Fig. 3 is a sideelevation of the clutch mecha-.

nism with the cover plate removed, showing the.-

afzgfriction. band in operativeengagement with the driving rim;

Fig. 4 is a view similar to Fig. 3 showing the toggle broken to release the friction band from the rim; and

40 Fig. 5.is a plan view of the striker arm.

The illustrated embodiment of the invention comprises a drill press having a frame 10. on which is mounted a housing 11 containing the clutch mechanism for controlling the feeding operation of a rotating tool-carrying spindle 12; which is movable axially or longitudinally with the sleeve 13. The sleeve 13 has a rack 14 with which a pinion 15 engages. t will. be understood that the pinion 15 is driven in. one direction. to move'the spindle l2 downwardly toward the work, and after a predetermined movement in thisdirection the spindle '15 isreleased, suitable mechanism, such as a weight (not shown), connected to a chain 15.returns thespindle 12 and 55 sleeve 13 to its. normalaposition. Themechanism for rotating the spindle. 12and associated parts are not shown since these form no part of the.

present invention. a

The housing or casing 11 consists of. an inner. section 1'? and an outer section. 18; held in place by five screws 19. The inner section 'l7-issecured to a housing 20. A shaft 21 has one end: journalled in the housing 20. and mountedon. this shaft is the rack-driving pinion. A sleeve 22 having a flange 23 abuts the pinion l5, and both the pinionandsleeve are keyed to theshaft 21 by a key 24. Surrounding the sleeve 22 isa. hub 25 which has bearing the housing.20-. Integral with the hub 25 is a disc. 26 having an, outwardly projecting rim 27. on which .is. formed a worm Wheel 28. The wormwheel. 28; meshes with a worm 29. on. a vertically disposed shaft 30, which. may be driven by any suitable means (not shown).

Within the :drivingrim 2'7 is a split friction. band 31 of bronze or other suitable material, one

end of which iszsecured bya screw 32toa disc 33..

which is rigidly fixed asby screws (not shown). tothe flanged head23 of: the sleeve 22. It will be apparent that when the friction band 31 is, expanded into operative engagement with the rim 2'7'the rack l l'of the tool-carrying spindle. 12 is driven throughfthe' disc 33, flanged head 23. and hub 22, which is keyed to the-shaft 21 .and the pinion 15, which is likewise keyed to the shaft 21.

The friction band 31 is contracted or expanded by a toggle hereinafter referred; to as the first. toggle, consisting of links .34:and .35 whichsare pivotally connected at their remote ends to the spaced ends of the split friction band 31, the link: 34 pivoting onthe screw 32 and the link 35 pivoting. on a screw. 36 connected to a lugB'lintegral with the band 31; The adjacent ends of thelinks 34and 35"are connectedby a screw 38 on whichisalso pivoted'a link 39101" a second toggle. Disposed on opposite sides of the opposite end 'of; the link 39 are arms so and ll, the end portion of the link 39.and; the lower end portions of thearm- 40. and 41' being connected by a screw 42, on which. thelink 39pivots.

Projecting from the shaft 21. is a. reduced eX-. tension 43, over which. fits a sleeve ihaving diametrically opposed cam wings 45 and 46-. The sleeve 44'v is free to turn relatively'tov the shaft. extension 43; but is preventedfrom.endwiseimovee; ment by a pin 47sdisposed in-an annulargroovei48: on the shaft extension 43. Fitting overtheend: portionofxthe sleeve 44' is acap member 49;.which. is fixed. for rotationwith the sleeveeby a pin;50.

The arms 40 and 41 are formed respectively with longitudinally elongate openings 51, which are disposed on opposite sides of the cam members 45 and 46 and enable the arms 40 and 41 to be moved longitudinally, as will hereinafter appear. Integral with the arm 41 and extending transversely thereof above the cam members 45 and 46 is an abutment plate 52 against which the cam members are adapted to abut. Integral with one side of the abutment member 52 is a lug 53 through which screws 54 extend for securing the arms 40 and 41 together. t will thus be seen that the arms 40 and 41 provide a unitary assembly, which with the link 39, forms the second, toggle.

Surrounding the sleeve 44 and cam members 45 and 46 is an elongate yoke 55 provided with parallel sides 56 and 57 to receive the abutment member 52 and adjacent parts, and guide the longitudinal movement of the arms 40 and 41. A coil spring 58 has one end seated in a cup 59 having a screw threaded shank 60 screwed into an enlargement 61 of the yoke, and the opposite end of the spring 58 seats against the abutment member 52. The cup member 59 may be manually adjusted for regulating thetension of the spring 58 after the outer casing section 18 is removed. In this manner the torque pressure at which the friction band 31 slips relatively to the rim 27 may be regulated.

A stop 62 on the disc 33 prevents the second toggle from breaking in one direction. The sec ond toggle, however, may be broken by rocking the sleeve 44 in a clockwise direction (Fig. 3) and when broken the parts assume the position indicated. in Fig. 4, the coil spring 58 insuring breakage of the second toggle as well as the first toggle made up of the links 34 and 35.

In order to obtain a snap action when the sleeve 44 is rocked in a clockwise direction (Fig. 3), a lug 63 is integral with the disc 33 and projects outwardly therefrom. The upper surface of the lug 63 is disposed adjacent the underside of the sleeve 44 beneath the cam wings 45 and 46. One side 64 of the lower surface of the lug 63 is inclined upwardly and outwardly at an abrupt angle, but the lower surface 65 is substantially fiat, although a slight curvature may be provided. Carried by the lower side of the yoke 55 is a roller 66 which, when the toggles are straightened or unbroken, engages the lug surface 65.

It is apparent that when the sleeve 44 is rocked to cause the cam wing 45 to bear against the abutment plate 52 and swing the assembly to the right of Fig. 3 the roller 66 engages the inclined surface 64, and the force of the spring 58 abruptly breaks the second toggle as well as the first toggle and snaps the parts to the position shown in Fig. 4. The parts are held in this position until the cam wing 46 is rocked in a counter clockwise direction (Fig. 3) to straighten out the toggle links. j

An important feature of the above described construction consists in relieving the friction band 31 from frictional engagement with the rim 27 by movement of the sleeve 44 in one direction or the other. As above pointed out, rocking movement of the sleeve 44 in a clockwise direction fully breaks the above described toggles, thereby relieving the friction band from engagement. in the opposite or counter clockwise direction (Fig. 3) serves to force the cam wing 46 against the abutment plate 52 and move the second toggle longitudinally against the tension .of the '(Fig. 3), as above pointed out both toggles are Rocking movement of the sleeve 44 coil spring 58. As above pointed out, the stop 62 on the disc 33 prevents breaking of the toggle in this direction, but the longitudinal movement of the link assembly serves to break the first toggle made up of the links 34 and 35, thereby contracting the friction band 31 from engagement with the rim 27. As soon as the sleeve 44 is released the spring 58 moves the second toggle longitudinally to expand the friction band 31 by straightening out the first toggle formed by the links 34 and 35.

A predetermined movement is imparted to the tool-carrying spindle 12 in a feeding direction, the operation being such that after feeding movement of the spindle commences it continues until the drive is released whereupon it is returned to normal position. In the illustrated embodiment of the invention, after both the above described toggles are straightened out to expand the friction band 31 into engagement with the driving rim 2'7, the parts remain in frictional engagement for a predetermined travel, and thereafter the friction band 31 is automatically contracted to disconnect the driven parts from the driving mechanism. For this purpose the arm 40, which forms a part of a link for the second toggle, has an extension 67 integral therewith. Interposed in the path of movement of the arm extension 67 is a stationary stop 68 secured to a disc 69.

When the extension 6'7 engages the stop 68, assuming the parts rotate in a counter clockwise direction (Fig. 4) the-second toggle is broken and the friction band contracted in the manner above described. In this manner the friction band 31 is released from the driving rim 27 and the weight attached to the chain 16 returns the tool-carrying spindle 12 to normal position ready for the next operation.

The disc 69. hasa hub 70, which is mounted on the tubular cap member .49, the disc 69 being disposed on the inside of the casing section 18, and a dial '71 being disposed on the outer side of such casing section. Screws 72 secure the dial 71 to the hub '70. A clamping bolt, '73 having a knurled sleeve 74 clamps the disc-69 in place andprevents movement thereof relative to the casing 11. vIt will be observed that the dial '71 is calibrated to denote different lengths of feed for the tool-carrying spindle 12. By setting the dial relative to an indicator '75 on the casing 11. according to the feed desired, no further adjustment of the mechanism is necessary. Turning movement of the dial '71 changes the position of the stop 68, and thereby governs the point at which the second toggle is broken and the friction band 31 is consequently contracted.

The. tubular cap member 49 projects beyond the dial 71, and secured to the outwardly extending portion is a handle '76. An important feature of the invention resides in the control of the clutchand spindle 12 by the handle 76.

,When'the handle is rocked in one direction to move the cam wing 45 in a clockwise direction broken and the friction band contracted out of 140 driven engagement with the rim v2'7. Substantially simultaneously with the contraction of the friction band 31, the cam wing 46 engages the upper right hand edge portion of the lug 63 so that the tool-carrying spindle may be moved upwardlyor away from the work. Thus movement of the handle to the right of Fig. 1 operates to contract the friction band 31, thereby disconnecting the. tool-carrying spindle 12 from the arge-'59 feeding mechanism, and concomitantly the spindle may be manually moved by movement- 0f the-handle '76 upwardly or away from the work. This is important should the tool becor'ne broken or damaged, making it necessary to move the spindle upwardly away from the Work before the normal cycle of operation iscompleted By movement of the handle 76 in a counter clockwise direction (Fig. 1), as above explained, thecam wing 4'6 operates tocompress the coil spring 58',- and moves the-seoondtoggle longitudinall'y to contract the friction band 31 by the first toggle. Simultaneously with'this movement the lower edge of the cam wing 45 engages the adjacent surface of the lug 63, and through the connections above described the tool-carrying spindle-12 may be moveddownwardly or toward the work. The advantage of this feeding movement preliminary totheordinary feed is to save time since the tool may bebrought down to the work before the clutch is connected for mechanicallyfeeding the spindle.

From the above description it is apparent that the tobl carrying spindle '12 can be advanced ahead of the feed or returned at the will of the operator, while drilling or when idle, and will continue the stroke when the lever '76 is again pulled down and released, that is, when the second toggle has been broken, movement of the lever 76 in a counter clockwise direction (Fig. 1) straightens out the toggles to expand the friction band 31 so that the tool spindle 12 is connected to the drive.

Although I have shown only the specific form of my invention, which I now believe to be the best, it is to be understood that numerous variations in construction, materials, and arrangement of parts, may be made within the scope of the invention.

What I claim is:

1. In a metal working machine having a tool spindle and feeding means therefor including a shaft connected to actuate said spindle and a power-operated drive for said shaft, a clutch for connecting said drive and shaft, said clutch comprising a split friction band, means connecting said band to said shaft for rotation therewith, a toggle connecting the ends of said band for forcing same into operative engagement with said drive, a second toggle connected at one end to the joint of said first toggle, cam means for straightening out or breaking said second toggle, and means for operating said cam means.

2. In a metal working machine having a tool spindle and feeding means therefor including a shaft connected to actuate said spindle and a power-operated drive for said shaft, a clutch for connecting said drive and shaft, said clutch comprising-a split friction band, means connecting said. band to shaft for rotation therewith, a toggle connecting the ends of said band for forcing same into operative engagement with said drive, a second toggle connected at one end to the joint of said first toggle, the outer link of said second toggle comprising a pair of laterally spaced arms, means rigidly connecting said arms, a tran versely disposed abutment member on one of said arms, a yoke disposed between said arms and providing a guide for said abutment member, a coil spring bearing respectively against one side of said abutment member and yoke, a rockable cam having a fixed axis engageable with the opposite side of said abutment member and adapted to break said second toggle when rocked in one direction, manually operated means for actuating said cam, and a stationary stop engageable by the other of said arms for automatically breakingsaid toggle 7 3. In a metal working machine having a tool spindle and feeding means therefor including a shaft connected topactuate said spindle and a power-operated drive for said shaft, a clutch for connecting said drive and shaft, said clutch comprising a split friction band, means voperatively connecting saidband to said shaft for rotation therewith, aftoggle connectingthe ends of .said band for forcing same into operative engagement- With said drive, a second toggle connected at one end to the joint of said first toggle, a'transversely disposed abutment member on the. outer link of said second toggle, spring means bearing against the outer side of said abutment member, a-double acting cam rockable about a fixed axis engaging the opposite'side of said abutment'member, manually operated means-torock said cam, anda stop preventing breakage of said toggle in one direction whereby rocking movement-of said cam in one direction breaks said second toggle thereby releasing said first toggle and friction band and rocking movement intheopposite direction moves said first toggle longitudinally thereby breaking said first toggle and contracting said friction band 4. In a metal working machine having a tool spindle and feeding means therefor including a shaft connected to actuate said spindle and a power-operated drive for said shaft, a clutch for connecting said drive and shaft, said clutch comprising a split friction band, a disk secured for rotation to said shaft, means for securing said band for rotation to said disk, a toggle connecting the ends of said band for forcing same into operative engagement with said drive, a second toggle connected at one end to the joint of said first toggle, a stop for preventing breaking of said toggle in one direction, an abutment member on the outer link of said second toggle, a double act'- ing cam member rockable about a fixed axis and engaging said abutment member, manually operated means for turning said cam member, a yoke surrounding said cam member and providing a guide for guiding the movements of said outer link, a spring bearing respectively against said yoke and abutment member, and abutment means on said disk engageable by said cam member thereby to turn said shaft inone direction or the other simultaneous with the release of said friction band by said manually operated means.

5. In a metal working machine having a tool spindle and feeding means therefor including a shaft connected to actuate said spindle and a power-operated drive for said shaft, a clutch for connecting said drive and shaft, said clutch comprising a split friction band, a disk secured for rotation to said shaft, means for securing said band for rotation to said disk, a toggle connecting the ends of said band for forcing same into operative engagement with said drive, a second toggle connected at one end to the joint of said first toggle, a stop for preventing breaking of said toggle in one direction, an abutment member on the outer link of said second toggle, a double acting cam member rockable about a fixed axis and engaging said abutment member, manually operated means for turning said cam member, a yoke surrounding said cam member and pro viding a guide for guiding the movements of said outer link, a spring bearing respectively against said yoke and abutment member, means to adjust the tension of said spring thereby to regulate the torque pressure at which said friction band slips relative to said drive, and abutment means on said disk engageable by said cam member thereby to turn said shaft in one direction or the other simultaneous with the release of said friction band by said manually operated means.

6. In 'a metal working machine having a tool spindle and feeding means therefor including a shaft connected to actuate said spindle and a power-operated drive for said shaft, a clutch for connecting said drive and shaft, said clutch comprising a .split'friction band, a disk secured for rotation to said shaft, means for securing said band for rotation to said disk, a toggle connecting the ends .of said band for forcing same into operative engagement with said drive, a-seccnd toggle connected at one end to the joint of said first toggle, a stop for preventing breaking of said toggle in one direction, an abutment member on the outer link of said second toggle, ardouble acting cam-member rockable about a fixed axis and engaging said abutment member, manually operated means for turning said cam member, a yokesurrounding said cam men'iberand providing a guide for guiding the movements of said outer link, a spring bearing respectively against said yoke and abutment member, an arcuatelyshaped lug on said disk fitting the under surface of said cam member adapted to be operatively engaged by said cam member substantially upon release of said friction band by movement of said manually operated means in either direction.

7. Ina metal working press having a tool spindle and feedingmeans therefor including a shaft; connected toactuate said spindle and a'power-operated drive for said shaft, a clutch interposed between said shaft and drive comprising a split friction band engageable with said drive, means providing a positiveconnection between saidband and spindle shaft, toggle means for actuating said friction band to and from operativeposition, spring means tending to hold said toggle in operative or inoperative position, and a'double-acting cam member for actuatingsaid toggle means and constructed and arranged to impart force through said toggle, means and connection for rotating said spindle shaft in one direction or the other.

CHARLES F soHENcK. 

